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website/src/lib/components/file-list/unsaved-prompt.svelte.ts

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+import type { UnsavedChoice } from '$lib/engine';
+
+type Prompt =
+    | { kind: 'unsaved'; names: string[]; resolve: (choice: UnsavedChoice | 'cancel') => void }
+    | {
+          kind: 'overwrite';
+          names: string[];
+          resolve: (choice: 'overwrite' | 'reload' | 'cancel') => void;
+      };
+
+/** The question that the user is asked, shown by `UnsavedDialog`. */
+export const unsavedPrompt: { current: Prompt | undefined } = $state({ current: undefined });
+
+/**
+ * Asks what to do with files that have unsaved changes when they are closed: save them, discard
+ * the changes, or `'cancel'` to keep going as before.
+ */
+export function askUnsaved(names: string[]): Promise<UnsavedChoice | 'cancel'> {
+    return new Promise((resolve) => {
+        unsavedPrompt.current = { kind: 'unsaved', names, resolve };
+    });
+}
+
+/**
+ * Asks what to do with files that have changes and were also changed on the disk: `'overwrite'` the
+ * disk, `'reload'` the disk (the changes are lost), or `'cancel'`.
+ */
+export function askOverwrite(names: string[]): Promise<'overwrite' | 'reload' | 'cancel'> {
+    return new Promise((resolve) => {
+        unsavedPrompt.current = { kind: 'overwrite', names, resolve };
+    });
+}